Effect

In the turn that Yawn is used, the only effect will be the user yawning at the target. At the end of the next turn, the target (if still active) will fall asleep unless it gets affected by a major status condition in the meantime, a status-protecting move is used (like Safeguard or Uproar), or the battle ends.

Yawn will fail immediately if the target has a substitute, a major status condition, or when used against a Pokémon with Insomnia or Vital Spirit as its Ability.

If a Pokémon falls asleep through some other means while affected by Yawn, then wakes up, Yawn's effect proceeds as normal at the end of the next turn.